季节冻土区铁路路基振动加速度现场监测

王子玉; 凌贤长; 惠舒清

doi:10.11779/CJGE201509005

季节冻土区铁路路基振动加速度现场监测 English Version

王子玉^{1, 2},
凌贤长¹,
惠舒清^{1, 3}

1. 哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090; 2. 琼州学院,海南三亚 572022,3. 神华包神铁路集团公司,内蒙古包头 014014

基金项目: 国家自然科学基金项目（41430634）; 神华巴准重载铁路路; 基稳定性评价与病害控制技术项目（201212240384）; 国家重点基础研; 究发展计划第四课题项目（2012CB026104）

详细信息

作者简介:
王子玉(1979- ),女,博士研究生,主要从事交通荷载下冻土路基振动特性研究。E-mail: iamwziyu@163.com。

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出版历程
- 收稿日期: 2014-07-11
- 发布日期: 2015-09-17

Field monitoring of vibration response of subgrade in a seasonally frozen region

1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China; 2. Qiongzhou University, Sanya 572022, China; 3. Shenhua Baoshen Railway Group Corporation, Baotou 014014, China

摘要

摘要: 为研究季节冻土区铁路路基在不同冻结时期振动特性,针对典型深季节冻土区大庆分别在冻结期、春融期和正常期进行列车行驶路基振动加速度的现场监测。研究结果表明：①季节冻区路基振动加速度有效值衰减速曲线可用负指数函数拟合;②路基振动强度受列车类型、行驶速度、列车编组、列车载重等因素共同影响;③受环境温度变化的影响,在冻结期自路基基床表层向下冻结,这部分冻结层使路基强度和刚度增加,阻尼比减小,因而导致加速度幅值在纵向和竖向被放大而在水平方向被抑制;④在春融期自基床表层向下开始解冻,由于其下部土体仍处于冻结状态,融化产生的水分无法及时从底部排出,于是形成饱水层使结构层强度大大降低,此时在上部列车荷载作用下,加速度幅值在纵向和竖向被抑制而在水平略有增加。
- 季节冻土区 /
- 现场监测 /
- 铁路路基 /
- 振动反应 /
- 加速度幅值
Abstract: To investigate the dynamic characteristics of ground vibrations induced by moving vehicles in a seasonally frozen region, three field experiments are carried out in the Daqing area of China in various periods throughout the year, in spring, summer and winter, respectively. The results show that: (1) The negative exponent function is employed to fit the vibration attenuation laws of subgrade, and the fitting parameters are provided. (2) The acceleration response amplitudes are influenced by train types, train formation, travel speed and train load together. (3) In the frozen period, owing to the fact that the frozen embankment surface layer increases the rigidity of the system and reduces the energy dissipation capacity, the vibration responses in vertical and longitudinal directions are amplified rather than those in the unfrozen and thawing period. In the same reason, the frozen embankment surface layer certainly restricts the lateral vibration role and reduces its response. (4) In the spring melting period, the permafrost melts in two ways, and there is still a certain thickness of the frozen layer in the middle of the embankment, which will prevent the water content in the embankment surface from penetrating and will melt in spring. So the strength and stiffness greatly decrease, and under the train load, the acceleration amplitudes are reduced in the vertical and longitudinal directions and enhanced in the lateral direction.
- seasonally frozen region /
- field monitoring /
- railway subgrade /
- vibration response /
- acceleration amplitude

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参考文献(20)

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